Semi-flexible asphalt pavement special grouting material anti-rutting semi-flexible grouting technology

Special Grouting Material for Semi-Flexible Anti-Rutting Pavement

I. Introduction:

Semi-flexible anti-rutting pavement is a new type of pavement composed of large-void asphalt mixture and polymer-modified cement-based grouting material. It features high rutting resistance, skid resistance, aesthetics, and driving comfort.

BR01 special grouting material for semi-flexible pavement is a single-component special engineering material made from high-quality specialized cement, special redispersible latex powder, active powder, high-efficiency water reducer, setting regulator, defoamer, and modified with various polymers. After mixing with water, it is filled into the large voids of the semi-flexible pavement asphalt mixture. It exhibits excellent properties such as high injectability, low shrinkage, high strength and rapid hardening, wear resistance, and crack resistance.

II. Scope of Application

1. Heavy-duty highways, long steep slopes, ramps, toll stations, gas stations, parking lots, etc.

2. Traffic light intersections, BRT lanes, bus stops, urban expressways, etc.

III. Performance Characteristics

1. High injectability, strong permeability, no vibration required.

2. High rutting resistance, with a dynamic stability of up to 60,000 times/mm, which is 20 times that of SMA pavement.

3. Early strength, low water consumption, no shrinkage, no cracking.

4. Uniform color, durable, and no color difference compared to ordinary asphalt pavement.

5. Resistant to erosion from chloride ions in snow-melting agents.

III. Performance Indicators

Implementation Standards: JT/T 1238-2019 "Cement-Based Grouting Materials for Semi-Flexible Mixtures" and JTG E30 "Test Regulations for Cement and Cement Concrete in Highway Engineering".

V. Application Guidelines

(I). Construction Process of Semi-Flexible (Anti-Rutting) Pavement

Laying of large-void asphalt mixture → Preparation of special grouting material → Pouring of special grouting material → Curing → Opening to traffic

(II). Key Points of Semi-Flexible (Anti-Rutting) Pavement Construction

1. Laying of Large-Void Asphalt Mixture

(1). Mixing of large-void asphalt mixture: Use intermittent mixing equipment or continuous drum mixing equipment to mix the large-void asphalt mixture. Strictly control the asphalt dosage, mixing time, and mixing temperature. Excessive asphalt dosage will severely affect the pouring quality of the grouting material.

(2). Transportation of large-void asphalt mixture: Use dump trucks for transportation.

(3). Laying of large-void asphalt mixture: The base layer should be flat, solid, clean, and dry, with elevation and cross slope meeting design requirements. Spreading should be uniform and free from segregation.

(4). Compaction of large-void asphalt mixture: Use low-tonnage double-drum rollers, with rubber-tired rollers as auxiliary compaction tools. Water should be sprayed on the rollers during compaction. Strictly control surface flatness to avoid unevenness caused by changes in paving speed, uneven paving speed, or abnormal aggregate gradation.